Nut-lock.



F. J. MULLEN.

NUT LOCK.

APPLICATION FILED MAY, 5, 1914.

Patented Jan. 5, 1915.

egectgficaflon 'ot netters Patent.

' Application filed may 5, 1914. Serial No. 836,473.

To all whom it may concern Be it knownthat I, FRANK J MULLEN, citizen of the United States, residing at Leasburg, in the county of Crawford and State of Missouri, have invented certain new and useful Improvements in Nut-Locks, of which the following is a specification.

- This invention relates to nut locks and more particularly to an improved device of mthis character including a spring actuated pawl which, is carried by the nut and so arranged as to normally project into the b it opening formed in the nut to engage with in suitable grooves formed in the bolt, and. has for its primary object to provide a construction wherein the pawl may be readily mounted within the nut, the nut providing a housing for the pawl, and wherein the pawl may be readily moved to inoperative position to no permit the removal of'the nut from the bolt.

A further object of the invention is to provide a construction wherein the pivot pin connecting the pawl and the operating lever therefor, will form. a stop so arranged as to 255 limit the pawl in its inward movement in engagement with the bolt, said stop being disposed to seat in a suitable recess formed in the adjacent face of the nut. And a still further object of the invention is to generally improve the construction and increase the efficiency bf devices of the above described character.

With these and other objects in view my invention will be more fully described, illustrated in the accompanying drawings and then specifically pointed out in the claims which are attached to and form apart of this application.

in the accompanying drawings: l is a perspective viewshowing my improved nut lock applied, Fig. 2 is a detail perspective view showing the sections oi the nut separated but in proper relative position with reference to the belt which is partly broken away, the pawl being removed, Fig. 3 is a transverse sectional view showing the nut in operative position upon the bolt with the pawl in engagement therewith, Fig. 4 is a s'ectipnal view of the bolt and showingthe so nut partly broken away, the pawl in engagement with thebolt and the disposition or the pivot pin for the'lever of the pawl, said pin forming a stop for the pawl when in operative position, and Fig. 5 is a detail perspecoe tive view of the pawl and the parts connect- Figure 1 ed' therewith, said parts "being shown detached but inprope'r relative position.

Corresponding and like parts are referred to in the following description and indi Patented Jan. 5, leis.

a bolt 10 which is shown as extending through the work 11. The bolt 10 is screw threaded adjacent one extremity in the usual manner to receive the nut 12 and is provided with a plurality of longitudinally extending grooves 13 each of which is provided with a radial straight wall aiid a corresponding in-- clined wall, the said grooves 13 being coextensive with belt. v

The nut 12 is formed with the usual threaded bolt opening 14 disposed to receive the bolt 10 and for the purpose of inserting the locking mechanism is formed in two superposed sections 15 and 16. Formed on one side wall of the nut midway between the end thereof is a transversely extending groove 16, such groove opening at its en trernities upon the upper and lower faces of the nut.

The sections 15 and 16 of the nut 12 when in assembled position as shown in Fig. 1 of the drawings may be secured together in any suitable manner. 'Medially formed in the confronting faces of the sections 15 and 16 is a suitable recess 17 which communicates with the bolt opening 1 and communicating with said recess and groove 16 is a suit able aperture 18, the aperture 18 opening upon the inner face or" the section 16 as shown. A. pawl 19 is provided which includes a suitablehead 20 and a shank 21, the head of the pawl being arranged within the recess 1?, while the shank thereof is the threaded portion oi the disposed to extend through the aperture 18 v and into the groove 16 as shown, and it will he observed that the pawl 19 is arranged ra'dially to the axis of rotation of the nut. The tree. extremity of the shank 21 is slotted longitudinally to receive the lever 22 which is enlarged at one extremity and is eecentrically mounted upon the shank being connected therewith by a pivot pin 23. One edge of the lever 22 at the enlarged extremity thereof is cut away to provide a cam face 2% and it will be observed that the opposite edge of said lever is straight throughice out its entire length. Positioned within the recess 17 and surrounding the shank 21 of the pawl is a helical spring 25, said spring being interposed between the head 20 of the pawl and therear wall of said recess, and

normally acting to project the pawl into' the bolt opening of the nut to engage within the grooves formed in the bolt.

The head 20 of the pawl is preferably formed with flat sideifaces as shown, and

it will be notedthat the adjacent face of the groove 16'.

saidhead is arranged-to contact with the drawings in which position of said lever,

the head of the pawl will engage Within one of the grooves 13 formed infthe bolt to thus revent retrograde movement of the nut. c release the pawl 19, the lever 22.may be swung to one side to withdraw the pawl 19 from the groove 13.

Particular attention is directed to the peeuliar formation and disposition of the pivot pin 23. Such pin is arranged to proj ect laterally upon one side of the shank 21 and in the operative position of the pawl in engagement with the bolt, seats within a suitable recess 27 formed in the adjacent side face of the nut which recess opens upon Said pivot pin therefore provides a stop for the pawl so arranged as to limit the pawl in its inward movement within the nut, the pivot pin 23 being so disposed that when seated in said recess, the

adjacent edge of the lever 22 will be slightly spaced from the adjacent wall of the groove 16. As will be obvious, the lever 22 being spaced from the adjacent face of the nut or being relatively free, when the pawl is in engagement with thebolt, any slight movement of said lever upon its pivot will not efiect the movement of the pawl 19 since to retract said pawl, the lever 22 must first be rotated upon its pivot tobring the adjacent face of the lever into contact with the adjacent face of the nut This is an important feature of advantage in my invention, in

that the lever 22 in the operative position of the pawl 19 is at all times relatively free Having thus described my invention-what I claim and desire to secure by Letters Patent is t 1. A nut lock including a bolt, a nut screw threaded thereon, said nut being formed in sections secured together, said sectionsbeing provided with coinciding recesses and the end wall of the recess'of one of said ections having an aperture formed therein opening upon one side face of the nut, a spring pressed pawl mounted in said recesses and extending through. said aperture, said pawl being disposed to engage the bolt, an operating lever carried bythe pawl and arranged exteriorly of the nut, and a stop carried by the pawl, said stop being adapted to limit the pawl in its inward movement in engagement with the bolt and maintain the adjacent face of the operating lever in spaced relation to the adjacent face of the nut.

2. A nut lock including a bolt, anut screw threaded thereon, said nut having a transversely extending groove formed in one side facethereof and being provided with a recess opening upon said groove, a spring pressed pawl carried by the nut and disposed to en- I gage the bolt, said pawl including a shank,

an operating lever carried by the shank and adapted to retract the pawl to inoperative position, anda pin pivotally connecting said lever with the shank, said pin being arranged to extend laterally upon one side of the shank and providing a stop' arranged to seat in'said recess'intheoperative position of the 'pawl to limit said pawl in its inward movement in engagement with the bolt and maintain the operating lever relatively free within said groove. I

In testimony whereof-1i afiix my signature in presence of two witnesses.

Witnesses:

T. N. Rnnvns, W. B. Kme. 

